Malicious PDF — malware analysis report

Static analysis result for SHA-256 13995d773ee39ce5…

MALICIOUS

PDF

71.4 KB Created: 2021-02-04 10:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e1d994e1f289f4318efbe9057116fad6 SHA-1: f086bf2e28bc53ee32bc4a4841d14f7f3f8cf2e7 SHA-256: 13995d773ee39ce549fd6e9e156dda557321b03d540a5caa194a57e0737ef2c3
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=i%2527ve+seen+all+good+people+chords In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fdb27a6979cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_6000463c245ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480876/normal_5fdea5cb22a24.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/towojujigurilerowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5fe9d27517691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_60043d3e79d8c.pdfIn PDF document text
    • http://pomirkapa.site/notice_chaudiere_de_dietriche2bpa.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/89446360101.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/foremitowabiboto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5fff4186949ef.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/3056715.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/2863331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazowaz.rf.gd/speak_your_mind_1_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 5364 bytes
SHA-256: 959cb0f6fe99f16ac39269eb584de94d8c35da71dc1f8b4e26107ed595ae8ff8
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10532 bytes
SHA-256: 8fba1d0ae9a0042b409a2c6df1264cc775347f02fd2b0b6b825107573b7f70dd

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